I just received another w2 in the mail but I already received my refund. How can I go back and file on this w2?

[DoninGA · Accepted solution]

You would have to file an amended tax return, Form 1040X, to add the W-2 to the accepted tax return.  An amended federal tax return can only be printed and mailed, it cannot be e-filed.  The IRS will take 16 weeks or longer to process the amended tax return.

See this TurboTax support FAQ on amending a 2016 tax return - https://ttlc.intuit.com/questions/3061514-how-do-i-amend-change-or-correct-a-2016-return-with-turbot....